The sensor button ”Exlider“ is located at the side of the smartphone. By this means the screen content can be scrolled up and down without swiping. In addition, this button can be used to enlarge or reduce the screen. The text thus becomes more readable, buttons can be easier to press and the camera zoom becomes easier to operate. The sensor button also enables a tactile feedback function, whereby the operating effect is confirmed to the user not only visually but also haptically.